refactor(cpus): use BIT macro in a consistent manner

In assembly code, BIT macro is used with a preceding hash #. Let's
update Cortex X1 code to follow the same convention. Excluding hash
doesn't cause compilation to fail or emit incorrect code.

Signed-off-by: Okash Khawaja <okash@google.com>
Change-Id: If304cdf90542d2edcab3e2d66cd7e905ff7fd047
1 file changed